This release introduces the first optional add-on `tracing`, added through the
new add-on model!
The existing optional `tracing` components Jaeger and OpenCensus can now be
installed as add-on components.
There will be more information to come about the new add-on model, but please
refer to the details of [#3955](https://github.com/linkerd/linkerd2/pull/3955) for how to get started.
* CLI
* Added the `linkerd diagnostics` command to get metrics only from the
control plane, excluding metrics from the data plane proxies (thanks
@srv-twry!)
* Added the `linkerd install --prometheus-image` option for installing a
custom Prometheus image (thanks @christyjacob4!)
* Fixed an issue with `linkerd upgrade` where changes to the `Namespace`
object were ignored (thanks @supra08!)
* Controller
* Added the `tracing` add-on which installs Jaeger and OpenCensus as add-on
components (thanks @Pothulapati!!)
* Proxy
* Increased the inbound router's default capacity from 100 to 10k to
accommodate environments that have a high cardinality of virtual hosts
served by a single pod
* Web UI
* Fixed styling in the CallToAction banner (thanks @aliariff!)